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♦ 1Conservation Biology of the Gaboon Adder (Bitis gabonica) in South Africa, Jonathan Kirk Warner, A dissertation submitted to the School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, South Africa in fulfilment of the requirements of the degree of Masters of Science (2009)
♦ 2Food Habits of the Snake Psammophis phillipsi from the Continuous Rain-Forest Region of Southern Nigeria (West Africa), GODFREY C. AKANI, EDEM A. ENIANG, ITOHOWO J. EKPO, FRANCESCO M. ANGELICI, AND LUCA LUISELLI, Journal of Herpetology, Vol. 37, No. 1, pp. 208–211, 2003